/*
 * Copyright (c) 1997 Guylhem Aznar <guylhem@danmark.linux.eu.org>
 * Copyright (c) 1994 Mike Finger <mfinger@mermaid.micro.umn.edu>
 *                             or <Mike_Finger@atk.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "../../configure.h"
#include <stdio.h>
#include <stdlib.h>
#include "List.h"
#include "Mallocs.h"
#include "../../src/module.h"


#ifdef BROKEN_SUN_HEADERS
#include "../../src/sun_headers.h"
#endif

#ifdef NEEDS_ALPHA_HEADER
#include "../../src/alpha_header.h"
#endif /* NEEDS_ALPHA_HEADER */


/******************************************************************************
  InitList - Initialize the list
******************************************************************************/
void InitList(List *list)
{
  list->head=list->tail=NULL;
  list->count=0;
}

/******************************************************************************
  AddItem - Allocates spaces for and appends an item to the list
******************************************************************************/
void AddItem(List *list, long id,long flags)
{
Item *new;
  new=(Item *)safemalloc(sizeof(Item));
  new->id=id;
  new->name=NULL;
  new->flags=flags;
  new->next=NULL;

  if (list->tail==NULL) list->head=list->tail=new;
  else {
   list->tail->next=new;
   list->tail=new;
  }
  list->count++;
}

/******************************************************************************
  FindItem - Find the item in the list matching the id
******************************************************************************/
int FindItem(List *list, long id)
{
Item *temp;
int i;
  for(i=0,temp=list->head;temp!=NULL && temp->id!=id;i++,temp=temp->next);
  if (temp==NULL) return -1;
  return i;
}

/******************************************************************************
  UpdateItem - Update the item in the list, setting name & flags as necessary.
******************************************************************************/
int UpdateItemName(List *list, long id, char *string)
{
Item *temp;
int i;
  for(i=0,temp=list->head;temp!=NULL && id!=temp->id;i++,temp=temp->next);
  if (temp==NULL) return -1;
  UpdateString(&temp->name,string);
  return i;
}

int UpdateItemFlags(List *list, long id, long flags)
{
Item *temp;
int i;
  for(i=0,temp=list->head;temp!=NULL && id!=temp->id;i++,temp=temp->next);
  if (temp==NULL) return -1;
  if (flags!=-1) temp->flags=flags;
  return i;
}
  
/******************************************************************************
  FreeItem - Frees allocated space for an Item
******************************************************************************/
void FreeItem(Item *ptr)
{
  if (ptr != NULL) {
    if (ptr->name!=NULL) free(ptr->name);
    free(ptr);
  }
}

/******************************************************************************
  DeleteItem - Deletes an item from the list
******************************************************************************/
int DeleteItem(List *list,long id)
{
Item *temp,*temp2;
int i;
  if (list->head==NULL) return -1;
  if (list->head->id==id) {
    temp2=list->head;
    temp=list->head=list->head->next;
    i=-1;
  } else {
    for(i=0,temp=list->head;temp->next!=NULL && temp->next->id!=id;
      i++,temp=temp->next);
    if (temp->next==NULL) return -1;
    temp2=temp->next;
    temp->next=temp2->next;
  }

  if (temp2==list->tail) list->tail=temp;

  FreeItem(temp2);
  list->count--;
  return i+1;
}

/******************************************************************************
  FreeList - Free the entire list of Items
******************************************************************************/
void FreeList(List *list)
{
Item *temp,*temp2;
  for(temp=list->head;temp!=NULL;) {
    temp2=temp;
    temp=temp->next;
    FreeItem(temp2);
  }
  list->count=0;
}

/******************************************************************************
  PrintList - Print the list of item on the console. (Debugging)
******************************************************************************/
void PrintList(List *list)
{
Item *temp;
  ConsoleMessage("List of Items:\n");
  ConsoleMessage("   %10s %-15s %-15s %-15s %-15s Flgs\n","ID","Name","I-Name",
    "R-Name","R-Class");
  ConsoleMessage("   ---------- --------------- --------------- --------------- --------------- ----\n");
  for(temp=list->head;temp!=NULL;temp=temp->next) {
    ConsoleMessage("   %10ld %-15.15s %4d\n",temp->id,
      (temp->name==NULL) ? "<null>" : temp->name,
       temp->flags);
  }
}

/******************************************************************************
  ItemName - Return the name of an Item
******************************************************************************/
char *ItemName(List *list, int n)
{
Item *temp;
int i;
  for(i=0,temp=list->head;temp!=NULL && i<n;i++,temp=temp->next);
  if (temp==NULL) return NULL;
  return temp->name;
}

/******************************************************************************
  ItemFlags - Return the flags for an item
******************************************************************************/
long ItemFlags(List *list, long id)
{
Item *temp;
  for(temp=list->head;temp!=NULL && id!=temp->id;temp=temp->next);
  if (temp==NULL) return -1;
  else return temp->flags;
}

/******************************************************************************
  XorFlags - Exclusive of the flags with the specified value.
******************************************************************************/
long XorFlags(List *list, int n, long value)
{
Item *temp;
int i;
long ret;
  for(i=0,temp=list->head;temp!=NULL && i<n;i++,temp=temp->next)
  if (temp==NULL) return -1;
  ret=temp->flags;
  temp->flags^=value;
  return ret;
}

/******************************************************************************
  ItemCount - Return the number of items inthe list
******************************************************************************/
int ItemCount(List *list)
{
  return list->count;
}

/******************************************************************************
  ItemID - Return the ID of the item in the list.
******************************************************************************/
long ItemID(List *list, int n)
{
Item *temp;
int i;
  for(i=0,temp=list->head;temp!=NULL && i<n;i++,temp=temp->next);
  if (temp==NULL) return -1;
  return temp->id;
}

/******************************************************************************
  CopyItem - Copy an item from one list to another
******************************************************************************/
void CopyItem(List *dest, List *source, int n)
{
Item *temp;
int i;
  for(i=0,temp=source->head;temp!=NULL && i<n;i++,temp=temp->next);
  if (temp==NULL) return;
  AddItem(dest,temp->id,temp->flags);
  UpdateItemName(dest,temp->id,temp->name);
  DeleteItem(source,temp->id);
}

